“There is an NDB at Compton airport, having a frequency of 378 Megahertz. But a note over its box says VFR Use Only. But if you look at El Monte's airport, it has an NDB, but no such note. Well, El Monte has an instrument approach procedure that uses the NDB, whereas Compton is strictly for navigational use, in case you can't calibrate your eyeballs to see a set of parallel runways!”